Refrigerator



FIG. 1 shows a top front right perspective view of a refrigerator showing our new design;

FIG. 2 shows a front elevational view thereof;

FIG. 3 shows a left side elevational view thereof; and,

FIG. 4 shows a top plan view thereof.

The broken line showing of is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a refrigerator, as shown. 